Okay this is scary but it is just adding a configure option to disable

* HTMLtree.c SAX2.c c14n.c catalog.c configure.in debugXML.c
  encoding.c entities.c nanoftp.c nanohttp.c parser.c relaxng.c
  testAutomata.c testC14N.c testHTML.c testRegexp.c testRelax.c
  testSchemas.c testXPath.c threads.c tree.c valid.c xmlIO.c
  xmlcatalog.c xmllint.c xmlmemory.c xmlreader.c xmlschemas.c
  example/gjobread.c include/libxml/HTMLtree.h include/libxml/c14n.h
  include/libxml/catalog.h include/libxml/debugXML.h
  include/libxml/entities.h include/libxml/nanohttp.h
  include/libxml/relaxng.h include/libxml/tree.h
  include/libxml/valid.h include/libxml/xmlIO.h
  include/libxml/xmlschemas.h include/libxml/xmlversion.h.in
  include/libxml/xpathInternals.h python/libxml.c:
  Okay this is scary but it is just adding a configure option
  to disable output, this touches most of the files.
Daniel
diff --git a/testRelax.c b/testRelax.c
index c930b51..dee4715 100644
--- a/testRelax.c
+++ b/testRelax.c
@@ -123,12 +123,14 @@
 		    files = -1;
 		    break;
 		}
+#ifdef LIBXML_OUTPUT_ENABLED
 #ifdef LIBXML_DEBUG_ENABLED
 		if (debug)
 		    xmlRelaxNGDump(stdout, schema);
 #endif
 		if (tree)
 		    xmlRelaxNGDumpTree(stdout, schema);
+#endif /* LIBXML_OUTPUT_ENABLED */
 	    } else {
 		xmlDocPtr doc;
 
@@ -185,7 +187,7 @@
 
 #else
 #include <stdio.h>
-int main(int argc, char **argv) {
+int main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED) {
     printf("%s : RelaxNG support not compiled in\n", argv[0]);
     return(0);
 }